Updated Gradle Wrapper to 2.0
Updated bintray plugin to 0.5
Added idea plugin
Removed maven publication to nexus
Set Java compatibility to 1.6
Use 'all' distribution for wrapper
Updated version and group
Refactored publishing

- use new maven-publishing plugin
- created custom install helper task
Added POM information
Adapted plugin config to adhere to plugin conventions

see http://plugins.gradle.org/submit for further details
Adapted unit tests to new plugin naming
Adapted README
Updated release notes